DTG Garment Printer Machine Maintenance Bible

customerMarch 18, 2019

There has been a lot of negative talk on industry forums and groups about the downside to DTG machines. The truth is there are THOUSANDS of DTG machines printing shirts every day. The happy printers are busy printing and don't spend time on industry forums. Yes, they have all learned "the secret" to making money with their machines and yes, it might have been a painful learning experience - BUT - once they figured it out AND took ownership of their investment - life was good.

What is "the secret?" MAINTENANCE, MAINTENANCE, MAINTENANCE.

These machines LIKE TO PRINT. That means if you are a casual part-time printer, the machine might set for a few days. Your CMYK colors should be fine. Your white ink will not be. THe TIO2 pigment will settle in the lines, clog the heads and make life miserable for you.

Large companies like Zazzle, Cafe Press, Spreadshirt and others run these exact machines. They found out the hard way that if you don't keep a DTG machine clean and try to keep the ink flowing you will have problems.

Before you decide NOT to buy a DTG machine because you just don't want the hassle, think again. A DTG printer will print a beautiful full color print on light and dark shirts in just a few minutes. OK, if you are a screen printer a few minutes is like a lifetime. But, if you are doing short runs with no setups, no color separations, no tear down and you are getting more than wholesale for a shirt - you will love this process. 

But, you will have to take ownership of your investment. It is NOT plug and play. It likes TLC (tender loving care) and to be pampered a little. If you don't want to accept the small responsibility of cleaning your machine before and at the end of the day - or don't want to take the proper steps to keep the ink moving every day (even with a simple head cleaning or two), then don't buy a DTG machine. Everyone will be happier.

Five Minutes Per Day is All I Ask

Maintenance on a DTG machine is not hard - it just takes a little time every day. Here are the things you should do EVERY DAY (at least when you are using the machine).

When You First Turn the Machine On

Maintenance

Maintenance Figure 1

This one is easy. When you turn the machine on in the morning, you should do two or three head cleaning cycles. This gets the ink moving and helps open up heads that might be partially clogged.

The rest of these items should be done at the end of the day.

Clean the Capping Station

This is the biggie. The capping station is that magic little "tray" that comes up against the bottom of the head assembly and caps it or seals it so the head won't clog. And, it caps the head from outside air when you are doing a head cleaning.

The problem is the capping station can get ink chunks (especially the white) over a period of time. After all, when the machine does a head cleaning cycle the capping station caps the head and a vacuum draws ink out of the head and dumps it into the waste tank. There is a chance excess ink sitting on top of the form that lines the capping station will start to build up and dry.

Maintenance Figure 2

Guess what? If the capping station won't cap tightly at night - what do you think will happen? The head will clog. If the clog is white ink, there may be ZERO way to salvage the $700 to $1500 head. A lesson well learned. But, you will first call your spplier and blame them for selling you a faulty machine. They will say "did you read the manual about keeping the capping station clean?" and you will say - I never read a manual. Get my point?

In Figure 1, you will see a very gunky capping station that was "clean" by a customer's standards. Figure 2 shows the simple steps in cleaning it. A "foam tipped swab" works well. Simply soak it in head cleaning fluid and wipe away the ink from that capping top.

Maintenance Figure 3

Keep the Capping Station Moist at Night

This is also a biggie. Since the capping station typically has a foam liner in the bed of it, there is a chance this foam will get crusty and full of ink. This ink can start to dry out. By simply putting a few drops of Capping Station Conditioner fluid on the capping station at night, you will keep the head "moist" and help prevent it from drying out.

Clean the Wiper Blade

All Epson based printers have a small wiper blade (it looks like a tiny windshield wiper). This blade is used to wipe the bottom of the head. As you print high speed and literally dump ink on a T-Shirt, the bottom of the head can start to get ink build up. The wiper wipes the head. The problem is if you are printing with white ink, the wiper can start to get a buildup of white ink that will dry causing the wiper to not be effective. You must clean the wiper blade every day! Clean the wiper the same way as the capping station.

Maintenance Figure 4

Clean the Bottom of the Print Head

When you are printing with the head very low and close to the shirt (for the best quality), the head will start to pick up lint off the shirt. And, ink can simply start to build up from the amount of ink being pumped through it. The Wiper Blade is suppose to clean off the bottom of the head but as you know, some of these parts on Epson based printers are like a toy. They only work pretty good. And, ink will start to get around the edge of the head. Using your foam tipped swab, wipe down the bottom of the head and around the edges. Be careful not to scratch the bottom of the head.

Check Your Ink Levels

One of the problems with an "open ink system" is that there is a close relationship between the height of the ink bottles and the bottom of the head. If the bottles are too high, ink will siphon out of the bed (you might wake up to find all the ink on the machine and the floor). If the ink bottles are too low, you will have ink starvation. On machines that use cartridges, you have little control over the height of the ink. If you are using a bulk ink system or open cartridges, do NOT overfill the cartridges or bottles. The manufacturer will generally put an "ink level" mark on the bottle or cartridge. That might not always be correct. You are much better off not topping off the bottles or cartridges and keeping the ink level in them more of a constant and refill them more often.

Maintenance Figure 5

Check the Spit Tray

On the side of the machine that is away from the capping station is what is called a Spit Tray. If you watch the printer print, you will see it stop every now and then and "spit" ink into this tray. This is like clearing its throat. It keeps the ink flowing. The spit tray can start to bulid up ink and sometimes during the spit, the head actually picks up ink. Keep the spit tray clean and not overflowing with ink.

Don't Neglect a Nozzle Check Every Day

This one really hits home for me. I stopped counting how many times someone called to complain about a poor print and when asked "did you do a nozzle check?" the response was no. A nozzle check tells you how the nozzles are firing. It is like a "report card." If all the nozzles are firing and the print is weak, then something else is going on. If only 50% of the nozzles are firing then it is OBVIOUS why the print is weak and the reason you only have 50% nozzles is probably a clogged capping station, crusty wiper blade, or the machine has been setting for a week without use.

Maintenance Figure 6

In order to see the white ink on a nozzle check, use clear film or something transparent. You can't clearly see how well the white ink is printing on white paper.

Should You Shut the Machine Down at Night?

Some manufacturers say to NOT shut the machine down. Others claim that the head caps better during shut down. This is true.

BUT, most software to drive these machines now has a "wakeup" feature. Since these machines like to run, you can set the software to do a head cleaning during the night to keep the ink flowing. If you set a machine to do a head cleaning two times per night, you will probably use about $4.00 USD of ink. No big deal if it saves a head!

If you don't have a head cleaning "wakeup" utility, then shut the machine down at night.

Shake the White Ink

The CMYK colors are much more stable than the white ink. The TIO2 will settle over night. Some brands of white ink have "hard settling" where the ink turns to small chunks. This is not good. If you shake the ink a little, you shake the chunks back into it. Head clogs! Other newer brands have a better way of trapping the TIO2 pigment and the settling is "soft settling." This means you can give the ink a shake and the thicker ink in the bottom of the bottle mixes back ink.

You should get in the habit of gently rotating and agitating the white ink bottles each morning before you print AND every night before you go home. Don't shake the bottles so hard that you get air bubbles in the ink. Just rotate and agitate a little. Gentle.

How much time does the above daily maintenance take? My guess... five minutes.

Weekly Maintenance

If you prin ta lot, you will undoubtedly start to get lint from shirts on key parts. All Epson based printers have drive belts, encoder strips, and other moving parts that can get lint and ink stuck to them.

Clean the Encoder Strip

A lot of people suggest cleaning this daily and if you print 24/7 then that is OK. For most printers, this can be cleaned once a week.

The Encoder Strip is that little strip of plastic that goes across the back of the machine. If you look closely at it you will see small little marks on it. This is the "brains" to the printer. The head had a sensor that reads the tick marks on this strip and from that determines where "home" is.

If you start to get images in weird locations and images that don't even belong to yours in various parts of the shirt, chances are the Encoder Strip has ink or lint on it. You have just confused "the brain."

Clean the Encoder Strip very carefully. You can remove it from the machine (remember which way it goes!), but you can actually clean it on the machine. Use a foam tipped swab or better yet a small pre-packaged pad soaked with GPI cleaning solution.

OK, if you own a standard inkjet printer, you are saying you NEVER have to clean any of these items. When printing on T-Shirts, the software driver is designed to literally open the flood gates and lay down 50 times more ink than for paper. This means you are creating a miniature "rain storm" inside your printer and thie excess ink gets on everything.

Maintenance Figure 8

Clean the Print Carriage Drive Belt Gear

There is a drive belt that moves the print carriage on all Epson based printers. Use a foam swab, and clean any lint from the belt gear.

Lubricate the Carriage

The head moves on a smooth rod and after time the rod can get dry and pick up lint. You should wipe the road down every week and then apply a light lubricant to it. You can use a standard "appliance/sewing machine" oil and put a few drops on the rod.

Check the Waste Tank Level

The Waste Tank is where money gets flushed down the drain. It is where all the ink goes from head cleanings. If the tank gets too full it will overflow. But, worse yet, the hose that goes from the capping station to the waste tank can get clogged. If this happens, the capping station will overflow when you do head cleanings.

Maintenance Figure 9

Also, many machines have an on/off valve going to the waste tank. There is a good chance when you use cleaning fluid on the capping station at night, that it might draw ink from the head and start a siphon that goes right into the waste tank - and then on the floor. By closing a valve to the waste tank at night, you prevent this. Just remember to open it in the morning!

Environmental and Location Concerns that Effect Print Quality

All DTG machiens don't like dry conditions. The ink in the head is more prone to clog if the air is dry. If you are in a dry area with low humidity, OR, if you plan to put the machine in a room with very dry heat in the winter, consider using a humidifier. The ideal conditions are: 50 to 65% relative humidity, dust free, with no airflow over printer. Room temperature 68 to 85 degrees F (20 to 29 C).

If you are a screener a DTG machine will not like to be in a hot shop full of lint.

If you are limited on space, try to find a way to NOT pretreat dark shirts near the machine. The mist of the pretreatment may get around the head and clog it.

Other Items Affecting Print Quality

Other than the daily maintenance, there are other things you can do to help print quality and reduce maintenance.

Preheat Shirts

Some shirts give off a lot of lint. If you simply place the shirt in a heat transfer press for a few seconds, you press down the fibers and you will have less lint, less fibers getting on the bottom of the print head, and much less problem with lint.

Keep the Shirt Holders Level

All DTG machines have the problem of quality vs making money for the manufacturer. The Shirt Holders are generally made of sheet metal which is not always flat. Make sure the board/holder is flat and if this means bending it, shimming it, or doing whatever it takes, then do it. You will have less head strikes and overall better prints.

Summary

By following the simple rules and taking five minutes per day, you will have a happy machine, happy customers, good looking prints, replace less heads, and in general have a great experience and love your machine!

 

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