It has been six months since I first got my Phlatprinter \\\. It is time for an independent review of the machine. The drive roller system still does not meet my expectations and numerous other issues abound.
I have broken down the areas of the machine in which I will report on separately.
X AXIS DRIVE ROLLERS
Let's start with the drive rollers themselves. I am on my third set of this design. The first set of course we know was a complete failure, but the second set should have corrected the design flaw, yet it was another failure as well. The end caps to which the pulleys attach was made of HDPE material which does not readily permit epoxy to adhere to it. My second set of rollers failed within 3 days of installation. That prompted a third set of rollers to be shipped which use an injection molded end cap that appears to address the issue. Since the drive belt has now failed and I am waiting for a new belt, I cannot even evaluate these rollers at this point in time.
X AXIS DRIVE BELT AND PULLEYS
The drive belt and pulleys chosen by Mark are a poor choice for the machine on numerous counts. These pulleys and belts were chosen because he had them in stock from the original MK1 and did not want to invest in another set of pulleys. While this would make sense from a cost standpoint, the design of the machine suffers as a result.
The 1/4" wide belt is insufficient to adequately drive the loads imposed by a two drive roller system of this nature. The belts stretch and they jump teeth when encountering excessive force applied against the rollers.
The grooves for the pulley are very shallow and the belt can easily jump a tooth when resistance is met rather than having the stepper motor stall.
The pulleys and belt are of the MXL series.
The pulley and belt choice causes the steps per unit setting in the controller to be about twice the value of the Y axis. This causes some problems with the USB CNC controller board that was chosen for this project.
A better choice would have been to use 3/8" width belts on the XL series of pulleys which have a .2" deep channel for the pulley teeth. This pulley and belt combination would have allowed the steps per unit setting to closely match that of the Y axis and would make it impossible for the belt to jump teeth.
X AXIS STEPPER
Again, Mark chose to use components in stock from the MK1 instead of picking the correct component for a new machine.
The X axis stepper motor is borderline too small for the application. A 266 ounce inch stepper would have ensured a better match for the requirements.
STEPPER MOTOR CONTROL BOARD
Here again, Mark had a sweetheart deal with a company in Mexico that makes inferior products. The stepper controllers fail frequently and have no current limiting circuitry. For the same money, one could have used a more modular system such as Probotic makes or for a few dollars more a top of the line Gecko controller could have made a much more stable product.
USB CONTROLLER
My experience with the USB Controller has been that it is still a beta product and not ready for production. While I have not used it for several months, it may be better now and I cannot attest to its current status. I reverted back to Mach 3 after encountering many issues with this controller even though I like many of its features.
SPINDLE
The supplied spindle and motor are absolutely junk! The spindles do not hold up under use and the motor generates electrical interference. The spindles come apart during operation. The motor only turns the spindle 15000 RPM which is inadequate for many CNC operations.
OVERALL CONSTRUCTION
The construction of the basic machine is excellent. The Y and Z axis performs flawlessly. The MDF parts fit together perfectly. Alignment is supurb. Access to all components is excellent. I rate this an A+.
SERVICE AFTER THE SALE
Support has been excellent. Mark has replaced all defective parts to date and tries to make good on his product.
