TOM build platform accuracy adjustment

thingiverse

Initially, I measured my TOM's travel capacity in all axes based on positions from the limit switches using 0.01mm increment jog mode on my Gen-4 interface. Upon positioning each axis until the red limit switch LED light was off and measuring every axis individually for maximum travel before any noise, I discovered that my Thing-O-Matic had 116mm of X travel, 123mm of Y travel, and 125mm of Z travel. However, these measurements did not correspond with the actual centered position of the build platform on the nozzle. Upon further examination, I found that at full X- (RIGHT, with limit switch off), my nozzle was approximately 5.6mm inside of the left edge of the build platform. At full X+ (LEFT, mechanical limits only), the nozzle was about 2.3mm past the right edge of the build platform. Similarly, at full Y- (REAR, limit switch off), my nozzle was approximately 7.81mm past the front edge of the build platform, while at full Y+ (FORWARD, mechanical limits only), it was about 5.75mm in from the rear edge. In essence, my build area was limited by incorrect geometry. To correct this issue, I created a 2D CAD file to illustrate the geometry of my TOM's build platform relative to the nozzle. The file revealed that the nozzle needed to be moved back about 6.78mm and to the left approximately 3.95mm for optimal alignment with the build platform. To correct this, I considered two options: building an entirely new build platform or repositioning the nozzle itself. However, both solutions require accurate calibration using a reliable set of digital calipers that can read in millimeters. As a TOM owner, it is essential to measure your machine's full travel capacity and compare it to the center of your build platform before attempting any adjustments. In conclusion, I will post more information when I have further updates on my project. For now, please ensure that you follow these instructions after measuring your TOM's travel capacity accurately.