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tinkercad.com
To change the shape's dimensions just hover over it and check the squares.
ALIGN SHAPES: Select both shapes (or hole) with click and Shift key, then top right tool to 'Align'
HOLLOW A SHAPE: put a hole shape inside the other (align it if required) and then, up right, group button
https://craftcloud3d.com/ , app.3dprint-uk.co.uk
3d printing types:
FDM (melts and extrudes)
MJF (better, HP)
SLA (laser, higher resolution)
SLS (laser, for mechanical)
Material: