Am about to install the heated conveyor belt -tensioner to my #ThingOMatic . The belt itself is already replaced with 0.025mm titanium with a Kapton surface.

The missing tensioning mechanism is some heavy oversight in the original +MakerBot Industries design as is the original plastic belt that expands+warps due to temperature ('heated' conveyot belt *hint*) and wear, is slightly too short after purchase because it hasn't expanded yet and the completely missing bed-leveling mechanism.

Designing a shortened lever-arm for this one as the lower bolt is a bit higher due to my removable ABP mod.
( http://www.thingiverse.com/thing:8878 This allows me to quickly replace the belt with e.g. my PCB routing platform http://www.thingiverse.com/thing:9280 to mill electronics.).
Have to start from scratch as there are no original design files for the tensioner are posted. Only an STL export and only as a complete bed of 4 parts.
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