I've now made my 8th attempt at printing a moderately complex model. The problem is that the height is too short. I made the switch some time back to M8x1.25 threaded rods and nuts. This let me have a simple M92 Z2650 statement that has worked like a champ, until this print.
Measured against the STL, the diff isn't consistent at each level, but in most places and overall it's at 77% of target. The part is supposed to be 80mm and it's coming in at 61.75
The print is a dual extruder print using the second extruder for support material. I've done numerous dual extrusion multi-material prints in the past with no Z distortion, but it was using the RAMPS 1.4 controller instead of the Printrboard/Extrudrboard I'm currently using. The print looks great except for the height problem. 8 attempts have consistent results.
I verified that the EEPROM (via the LCD controller,) has the correct M92 Z value. I checked the slicer and g-code output, the value is setting correctly.
Here's the frustrating part, I printed single material calibration cubes at 40mm an at 80mm and they came out perfect heights. This only seems to happen when I use the second extruder to print support material. I even printed the model using a single extruder, all one material and it printed fine. Very frustrating
I'll have to set up a multi-material dual extruder calibration that's high enough, the 30mm hilbert cube I printed is close to perfect, but not high enough to really tell if there's a problem.
All ideas appreciated.
(optional Dual Extrusion) Printrbot Plus V1 [3/2013]
bed stabilizers, bed levelers, Y & X belt tensioners,
50mm fan mount, LED ring light, Z-axis screw Isolators,
Z-shaft stabilizers,optional Bowden conversion, GT2 belts/pulleys,
M8x1.25 Z Screws, Flex. Z-couplers,
RAMPS 1.4 w/ LCD,
Quick Change Extruders:
Option 1- Dual hybrid geared Wade's/Bowden w/ 3mm & 1.75mm Ubis,
Option 2 - Dual direct geared Wade's w/ 3mm & 1.75mm Ubis
Option 3 - Single geared Wade's w/ 3mm or 1.75mm Ubis
Option 4 - Single belt drive Wade's w/ E3D
MIC-6 metal bed
Thingiverse Profile: http://www.thingiverse.com/tdeagan/designs