Had to remodel some parts.
The joints were modelled with a 12.40mm diameter for a 13mm aluminium tube. I increased it to 12.80mm.
There are some strange design decisions.
The assembly instructions are partly chinese and more of a rough draft on how to build it.
There are inconsistancies in the design. Sometimes there are countersunk nuts. Sometimes there are none. And sometimes the nuts go into a slot-in.
The firmware is only available as a precompiled hex. You cannot modify it for differently sized machines. That means you have to build the machine as it is defined by the firmware and you cannot adjust minor differences in the length of the arms.
Also the firmware is a stripped down modification of the Marlin firmware. Although all credits to the have been taken out. Marlin is distributed under the GPLv3 license. What GPLv3 means can be read here (https://tldrlegal.com/license/gnu-general-public-license-v3-(gpl-3) ). None of these "musts" are respected.
I would not recommend making this thing in it's current state. You will be disappointed with the final product.