Printing problem

[matej 0]

Hi to all 3D printers :grin:

When printing 3D coin (note jpg in att) it happens that lower part of object isn't printed well as suposed to be. Can anyone help me to solve this issue.

TNX a lot and have a nice day!

Matej from Slovenia

 

[mikey 0]

When 3d printing with these FDM machines, there is a 45 degree rule. The idea is to make sure when a layer is printed on top of another, the edges of the two layers do not create an angle of 45 degrees or larger. Obviously there is room for give and take with the actual angle, but printing things with large overhangs or spheres are very difficult to get the bottom layers looking good. From the image it is hard to tell if there is anything on the back of the print, but if there isn't, print it laying down on the print bed.

 

[gr5 2,295]

This is a difficult object to print. Could you cut the coin in half and print each half flat? Then glue the 2 halves together.

If you will be printing lots of small objects like this you might want to get a smaller nozzle (.25mm) instead of .4mm to get better XY resolution.

 

[matej 0]

Thanx to both of you for answering me, I really appreciate that. Gr5 could you please explain the procedure how to change the noozle. Can I simply unscrew it and change with 0,25mm noozle?

 

[gr5 2,295]

Do you have UM Original? Or UM2?

On the UM Original it's easy. You can get nozzles on ebay - very inexpensive - cost of cup of coffee. Then you heat the nozzle to 180C before unscrewing old one and adding new nozzle.

On the UM2 it is very difficult because the nozzle is so complicated - it has the heater inside the nozzle.

Best thing to do is order a second nozzle (about 50 euros), then find someone with a machine shop who can fill in the existing hole with brass solder and then redrill out the hole. This is a very delicate operation. .25mm drills are extremely delicate. So you need precision equipment (drill press or lathe).

It takes 1 minute to change the nozzle on UM Original. 30 minutes on UM2.

Someone here in the USA is planning on redesigning the nozzle so that it is in two parts and selling different size nozzles. This has not happened yet.

Here is his post - maybe you should contact him:

http://umforum.ultimaker.com/index.php?/topic/6622-making-different-nozzle-sizes/

 

[tmrevlje 1]

Welcome to the forum Matej you will find it is a very resourceful and helpful community thanks to a few very quick to response and skilled 3D printing dudes, developers and actual Ultimaker Staff.