Layer Thickness improvement

Hi

I have a prusa iteration 2 and it is capable of printing 0.20 mm layer thickness. Are there any tips to reduce this number

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[www.3byazici.com]
[3dprintertr.com]

Before reducing the layer thickness, you should do something about all the bumps on the surface which were probably due to pauses while printing. Are you printing from SD card? I'm guessing that you're not and you have some communication problem between your PC and your printer controller. It can also be due to you PC not supplying the g-codes to the printer fast enough.

Thanks I am not printing from SD Card. I am open to all suggestions. I really want to improve print quality.

I am using sanguinololu, sli3r, prusa i2, 3mm abs, no heated bed, printing temp 258 C, 0.4mm nozzle,

Instead of heated bed, I am using PVC tape or ABS juice.

yoda

wedge

A video of printing

vase video

I have iteration 2, and i've had it work at 0.05 mm before.

Turn up the temperature 10-20 degrees, and increasing the movement between print areas (speed and acceleration) dramatically, to prevent ooze.

And for the record, almost nothing is worth printing less than 0.1 mm per layer.

@nefermu - How does the extruded filament look when you extrude in air? I don't see signs of pauses in the video but your walls are very rough with a lot of bumps. Perhaps there's something wrong with your hot end. If it looks smooth in air, perhaps your extruder hobbed bolt is slipping on the feed. Do you see plastic dust on the hobbed bolt?

Also, 258C is a very high hot end setting. Do you have the right thermistor table loaded on the firmware? If so, you should lower it down. With the corrected thermistor, ABS should be around 230C.

Edited 1 time(s). Last edit at 11/25/2012 09:17AM by brnrd.

Thanks for help,

Yes there is ABS dust on extruder and I will check thermistor table.

My thermistor is

EPCOS B57560G104F

and here is the firmware table. I have compared with wiki but numbers are completely different. I am not sure if my tables are that wrong


#if (THERMISTORHEATER == 6) || (THERMISTORBED == 6) // 100k Epcos thermistor
#define NUMTEMPS_6 36
const short temptable_6[NUMTEMPS_6][2] = {
{28, 250},
{31, 245},
{35, 240},
{39, 235},
{42, 230},
{44, 225},
{49, 220},
{53, 215},
{62, 210},
{73, 205},
{72, 200},
{94, 190},
{102, 185},
{116, 170},
{143, 160},
{183, 150},
{223, 140},
{270, 130},
{318, 120},
{383, 110},
{413, 105},
{439, 100},
{484, 95},
{513, 90},
{607, 80},
{664, 70},
{781, 60},
{810, 55},
{849, 50},
{914, 45},
{914, 40},
{935, 35},
{954, 30},
{970, 25},
{978, 22},
{1008, 3}
};

You're using the wrong thermistor table. You need to use the one here or generate one yourself using the correct parameters from that table. Here's how you can use the table from the wiki into the thermistortables.h.

#if (THERMISTORHEATER == 6) || (THERMISTORBED == 6) // 100k Epcos thermistor
#define NUMTEMPS_6 20
const short temptable_6[NUMTEMPS_6][2] = {
   {1, 864}, // 864.165363324 C
   {54, 258}, // 258.53991594 C
   {107, 211}, // 211.310066205 C
   {160, 185}, // 185.861725716 C
   {213, 168}, // 168.31793816 C
   {266, 154}, // 154.754297589 C
   {319, 143}, // 143.52544406 C
   {372, 133}, // 133.784751118 C
   {425, 125}, // 125.033500921 C
   {478, 116}, // 116.945124847 C
   {531, 109}, // 109.283980973 C
   {584, 101}, // 101.861768746 C
   {637, 94}, // 94.5095302806 C
   {690, 87}, // 87.0542728805 C
   {743, 79}, // 79.2915563492 C
   {796, 70}, // 70.9409729952 C
   {849, 61}, // 61.5523326183 C
   {902, 50}, // 50.25271896 C
   {955, 34}, // 34.7815846664 C
   {1008, 2} // 2.86606331838 C
};

It would probably be better to include more points but this would be better than what you're using now. Perhaps someone can share a better table for that thermistor.