The kids built a new robot in 123D Design yesterday and we tried to to print it using MeshMixer magic strut support. It is like printing on a spike bed 
All the pieces of the robot weren’t joined together so we ended qup with 4 parts and we are going to do another test later today. Perhaps standing up instead?
Anybody know how to get 123D to join all the parts before exporting to STL?
You hover over the symbol of a circle, square and triangle all in one, on the top bar. Then you have a choice of group, ungroup and ungroup all. Either select all parts the group them or click group the select all parts i have forgotten what comes first. Cam select all by holding down the left mouse button and drag a box around all of the parts.
Thanks but I do not think that actually solves my problem. I want to have a final model where all the parts stick together.
I tried doing that using the combine tool but I am uncertain it that is the “right” way to do it.
Please note that I am a bit of a 123D Noob 
I can’t help you with 123d but with meshmixer, you would be better off orienting the model at 45 degrees to the bed so you don’t have all that flat surface parallel to the bed that will need to be supported. You may also want to increase the width and density of the support struts.
Your kids modeled that robot from scratch? I’m impressed!
@Tim_Rastall ahh I thought that was a bug in the program trying to print at that angle when doing “optimal optimization”. Anyhow, now I am printing one standing up with supports. About 40% done and it looks good.
@Normand_Chamberland , not really from scratch. There are a lot of ready made modules in 123D.
Looks really cool! Nice project.
@Peter_Parnes Looks like that 123D app is very kid friendly!
Not as kids friendly as TinkerCad but TinkerCad is too simple for our taste.
