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Hi Schlotzz. Thanks for your reply. At the end I found out the "slipping" was due to my Delta DIY kit has not been calibrated (ha ha.. because I was a "CAN" Up! Plus printer user.). Now I calibrated the thermistor and adjusted the POT on A4988, and the machine is working quite stable now.

The "tension spring" that I mentioned in the last post is something similar to below linked image:

http://i01.i.aliimg.com/wsphoto/v1/1998277025/3-D-printer-parts-DIY-Reprap-Kossel-all-metal-planet-reducer-motor-bowden-extruder-alimunum-alloy.jpg_350x350.jpg

I thought the spring can press the filament constantly, but indeed the plastic body of your design already achieve the same as it can be blended slightly as always.

Thanks again.