If you're trying to merge 3d printed parts together, select the parts you want to merge by holding down Ctrl and selecting multiple parts. Then right click and choose to merge the parts. Be aware that once they are merged you will not be able to separate them aside from exporting them.
If you're trying to merge 3d printed parts together, select the parts you want to merge by holding down Ctrl and selecting multiple parts. Then right click and choose to merge the parts. Be aware that once they are merged you will not be able to separate them aside from exporting them.