Mini Kossel

Kossel 25000: new prototype with experimental brackets and 2040 vertical extrusions.

OpenBeam Mini Kossel Pro built by Johann with parts donated from Terence of http://www.openbeamusa.com

3D printed linear motion carriage with recirculating Delrin balls and adjustable preload. Source and STL files: https://github.com/jcrocholl/recirculating

Instead of the retractable Z probe, now using Force Sensing Resistors (FSR) sandwiched between the glass print surface and the triangle frame, wired up to the unused heated bed thermistor input.

In this video it's printing a Nexus 4 Wireless Charging Orb Cradle by pixil3d: http://www.thingiverse.com/thing:89762

This problem is very common and there are 2 ways to fix it:1. Adjust your DELTA_SMOOTH_ROD_OFFSET up or down by one millimeter and see if that makes it better or worse. Then adjust by half millimeter, and so on, until your first layer is completely flat.2. Add the autolevel Z probe to your end effector. It will automatically calibrate before each print if you add G29 to your slicer prefix. This will detect the bowl shape and automatically correct it so that your print is completely parallel to the print surface, and the first layer thickness is always exactly right.http://reprap.org/wiki/Kossel#Automatic_bed_leveling_probe

http://reprap.org/wiki/Kossel

This STL file on my github repository will be automatically kept up-to-date with future changes to these parts, using Makefile in the same directory.

You're right, and now I'm using a bowden extruder again.

Try http://groups.google.com/group/deltabot orhttp://www.makergeeks.com/ko3dprkit.html (can't vouch for them but the pictures look decent).

The holding torque is not a problem at all. But we want to reduce moving mass because of inertia (Trägheit). If the moving parts are as light as possible, the printer movements can be faster **and** more accurate.

Thanks. My latest firmware is available at https://github.com/jcrocholl/Marlin on the "kossel" branch. And I'm merging upstream improvements from ErikZalm back into my "deltabot" branch but still need to rebase autolevel support in there. Yes, I'm using Pronterface, but usually the command-line version (pronsole.py).

www.hotends.com has a new batch every Friday.

50% infill 105 mm/s

The automatic bed leveling is so precise that it is now possible to print PLA on unheated naked borosilicate glass without tape or hair spray. I printed a lot of these KOSSEL name tags at Seattle Maker Faire and they turned out great. They take about 10 minutes each and are just two layers thin, 0.4mm total.