Really good base. I took the liberty of ruggedising it in a few places as it’s intended for a 3-year old. There are two protrusions on the base to allow modules to be seated correctly. I accidentally broke one and as such removed the other and screwed it a hex bolt with a head the same diameter as the original protrusions which has worked well. Using what I learnt there I removed protrusions to seat the stairs and screwed in two hex bolts from underneath to anchor the stairs to the base solidly. To make sure the base remained level I screwed in two shorter hex bolts from under the base is the remaining two corners.
The design is very clever and it printed out well. The stairs needed very little sanding and very little cleanup needed on the other parts. I made a test fit of the stairs to the base and both lineup pegs broke off. So I reprinted the base. The line up pegs for the modules also broke off and I drilled out holes and glued in pegs which have worked very well.
had a couple of problems the arm that drives it up and down broke getting it of the plate was never going to be strong enough
and the motor mount broke trying to put the motor in
it is not clear whether I need supports or not but the main design is great
GREAT FIT, WELL DESIGNED