Success, of a sort

The recent modifications to my printer have made a huge difference.  Not only is it printing much more accurately, but I can print item after item without recalibrating.  There are further improvements to be made (aren’t there always?), but I’m now at a point where I can be reasonably confident of being able to print the parts I need to make modifications.  Here’s an example:

motor_mount

These two clamps are created so that I can mount a scavenged motor securely for my next project.  I modelled these in OpenSCAD, sliced them in Slic3er and printed them using Repetier-Host control software.  Everything just worked.  I haven’t mentioned Repetier-Host before, because I’ve only just become aware of it.  It’s a very nice front end for the printer, and manages Slic3r.  You can load and view a .STL file, slice it and print it from the same interface.  It’s slicker than Pronterface, which I had been using.  It’s definitely my software of choice now.  It makes it really easy to adjust the printing speed during printing – meaning that you can slow down the head for fiddly areas, and speed it right up for less important bits.

Flushed with success printing useful things, I thought it was time to try some frivolity.  Here’s a “Skull with pointed teeth”, from a model I found on thingiverse:

skull

It’s about 5cm tall.  It would look better printed in white plastic, but I’ve only got blue.  I’m really pleased with this print.  Next time, I’ll make it hollow and mount a couple of red LEDs in the eye sockets…

Finally, I decided to try something more complex.  Printing objects with overhangs is not simple for this style of printer, because there is no surface deposit material on.  So I have not tried it before.  Slic3r has a setting you can use which will help to print overhangs by printing columns of expendable support material underneath.  These can then be cut away when the print is complete.  The example I tried is a minion from thingiverse (if you don’t know what a minion is, you should watch the film Despicable Me at once).  Here’s a picture of it mid-print:

mid_minion

It’s hard to see the shape, because of all the support material (the vertical columns at the front), but you can see the honeycomb-shaped fill of the main part.  When the print is finished, the poor minion looks like this:

minion_with_support

Ten minutes with a scalpel, cutting away the scaffolding, and he looks like this:

minion_without_support

He’s a long way from perfect, but given the size (about 6cm tall), it’s not too bad.  His arms are only about 3mm thick, and they could not have been printed as part of the main figure without support.   Again, it doesn’t help that he is translucent blue rather than yellow.  Perhaps a paint job will improve him.  A light sanding certainly would.

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