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I have had the notched drive belt hop a tooth on the stepper drive wheel before, but I can't believe it could hop back on the next layer. In addition, the displacement seems too small to match a belt skip. Have you reviewed the gcode file to confirm the skip isn't there when it is sliced? I...

The rubbing on the infill may be caused by the extruded filament stretching and breaking as it bridges across the perpendicular infill that was laid down on the previous layer. As the hot filament breaks, the ends will sometimes curl up as it cools. When the extruder passes over the curled...

Ray, I did buy one of the 18" square heated bed PCBs offered on eBay. No issues with the purchase, packaging was great, quick delivery. Only two minor issues. 1) the board does have a bit of a warp, but that was mentioned in the listing and expected. 2) the tight spacing of the circuit path...

Don, What is the difference in print speed between the two printers? I think the quality of the gMax print can be improved by dropping the maximum allowed acceleration values in Slic3r and then slowing it down overall. I find that the original bed is a bit sloppy due to the springs, the short...

I took my installation back to zero to see if I could replicate any of the same issues on my Windows 8.1 laptop, but no (bad) luck... Here's what I did: 1. I uninstalled Repetier Host using Uninstall from Programs and Features in the Control Panel 2. I plugged in my gMax printer and went to...

Unfortunately I cannot try to replicate your issue until I return home this weekend, but I recall having a similar issue the first time I was working with an Arduino a couple of years ago. The drivers would not install with the board connected via USB. I think I just had to unplug the USB and...

I agree with Ray that my pots are probably turned up higher than they need to be as well. The only pot I turned down since I have been running the printer was the extruder stepper pot. (and I had turned it up first) The X,Y and Z pots all seem to work fine being turned up. I started with the...

For your question regarding the Slic3r configuration files, they are prepared for running Slic3r in Expert mode. When you start the program, go to File/Preferences and select Expert Mode, rather than Simple. Then restart the program. In expert mode, you will be able to choose different...

Based on my experience, I believe you still have some adjustment to do on the stepper drivers. You may be able to tell whether it is x or y based on how you had the Makerbot Robot oriented on the bed. I haven't had good luck controlling the extruder head in the x and y directions from the knob...

I agree it can be a bit tough to get everything working so you are able to print the first time out. To feed the filament into the hotend, press down the control knob next to the lcd screen once, which brings up several submenu headers on the screen. Turn the knob until the pointer is next to...

There are 4 bolts that have to be removed to pull the extruder stepper motor bracket off the carriage. Two of those bolts are the bolts you show in your photo that pass through the wood wedge plates that secure the hot end. Once the motor bracket is loose, the wood plates will be as well, and...

Don, Have you looked at 123D Design from Autodesk? (www.123dapp.com) It is free and has a native Mac OS version. I believe they have made a big effort in the past year to make it 3D printer friendly. You can also look at Blender (www.blender.org), which is a robust surface modeler with way...

On the initial setup of my gMax, I had to adjust the extruder stepper driver's potentiometer. I also had some difficulty getting the filament to feed correctly and after updating the idler lever arm that holds the smooth bearing, I had to trim off a portion of the spring to reduce the pressure...

My belt rubs a bit in the same location. Hasn't seemed to be a problem so far.

I found that a quick filament controlling strap could be easily made by sticking two pieces of blue painter's tape together, along with a light weight (I used a single stick of heavy duty staples I had on my table at that moment.). It works very well and keeps the filament feeding nicely for...

Just a thought. Don't know if this is the issue. The SD card is inserted under the LCD display with the contacts facing up. That is flipped from how the card is typically inserted into the card reader on most computers. Rick

Not enough time tonight to explain everything, but I also had difficulty with a sagging bed, and after trying a couple of different options, I purchased a 1/2" thick piece of polycarbonate (Lexan) and replaced the original bed that came with the unit. Here's a few photos. I think I am going to...

A couple of more pics and the Slic3r configuration file. Rick

9. Take a length of 1.75mm filament (PLA or similar - not Ninja Flex) and insert it into the pen tube nub and push it into the hot end. If you can feel the filament hanging up at the top of the hot end right as it exits the nub, you can try to ream out the tube/hot end interface a bit. I used...