Mari

Did some digging and found Cura-setup for this type of printer on the Hamlet-website... Did you change the Start/End G-code like is suggested? --> http://english.hamletcom.com/products/hp3dx100.aspx?t=download Download the Cura Setup file... in the ZIP you will find a PDF-file and 2 text-files for Start/End G-Code!

Check your machine-settings in Cura and post them here so we can take a look at it!

Did you check the specs of Ninjatek Eel filament? Slower speed is good, temperature of nozzle up to 250 is not good! Maybe the conductive material in the filament is clogging the nozzle... I print Ninjatek Cheetah a lot (on an Ender 3 Pro), with low printspeeds and temperature somewhere between the values in the spec!

Remove those profiles and see what happens...

You doubled the steps/mm that is a lot! Cura doesn't know the value of s/mm that is stored in the firmware of the printer. Cura tells the printer to raise the Z-axis x.xmm, the printer then knows how many steps the Z-stepper has to make (with the value stored in the firmware)... In your case the Z-axis will be lowered, not raised... So I find the very strange that it is impossible to print an STL sliced with Cura! Check settings, compare them with the settings in Creality Slicer.

Not all Ender 3 have thermal runaway protection enabled... Big fault made by Creality...

.... should print out of the box, no firmware update needed... Check printer if it is assembled the right way, they sometimes make mistakes in China! What layerheight did you use?

Wat heeft hij altijd gedaan? Niet hoger willen printen dan 4cm of wat anders? Kun je de carriage handmatig wel verder omhoog brengen dan die 4cm? Of dan ook niet. Je geeft niet veel informatie behalve welk merk en type en dat je nieuw bent met 3D printen...

I also use a Ender 3, you can use my start/end G-code if you like... Start G-code M201 X500.00 Y500.00 Z100.00 E5000.00 ;Setup machine max acceleration M203 X500.00 Y500.00 Z10.00 E50.00 ;Setup machine max feedrate M204 P500.00 R1000.00 T500.00 ;Setup Print/Retract/Travel acceleration M205 X8.00 Y8.00 Z0.40 E5.00 ;Setup Jerk M220 S100 ;Reset Feedrate M221 S100 ;Reset Flowrate M140 S{material_bed_temperature} ; start preheating the bed M104 S{material_print_temperature} ?T0 ; start preheating hotend G28 ; home M190 S{material_bed_temperature} ; heat to bed setting in Cura and WAIT M109 S{material_print_temperature} ?T0 ; heat hotend to setting in Cura and WAIT G92 E0 ;Reset Extruder G1 Z2.0 F3000 ;Move Z Axis up M300 S1000 P500 ; chirp to indicate starting to print G1 X5.1 Y20 Z0.28 F5000.0 ;Move to start position G1 X5.1 Y200.0 Z0.28 F1500.0 E15 ;Draw the first line G1 X5.4 Y200.0 Z0.28 F5000.0 ;Move to side a little G1 X5.4 Y20 Z0.28 F1500.0 E30 ;Draw the second line G92 E0 ;Reset Extruder G1 Z2.0 F3000 ;Move Z Axis up End G-code G91 ;Relative positionning G1 E-2 F2700 ;Retract a bit G1 E-2 Z0.2 F2400 ;Retract and raise Z G1 X5 Y5 F3000 ;Wipe out G1 Z10 ;Raise Z more G90 ;Absolute positionning G1 X0 Y{machine_depth} ;Present print M106 S0 ;Turn-off fan M104 S0 ;Turn-off hotend M140 S0 ;Turn-off bed M84 X Y E ;Disable all steppers but Z M117 Print Completed M300 S440 P200 ; Make Print Completed Tones M300 S660 P250 M300 S880 P300

You can heat hot-end and bed at the same time, just change the starting G-code in Cura... simply by first giving the command to heat both and then the command to wait for both to reach the desired temperature... M140 S{material_bed_temperature} ; start preheating the bed M104 S{material_print_temperature} ?T0 ; start preheating hotend G28 ; home M190 S{material_bed_temperature} ; heat to bed setting in Cura and WAIT M109 S{material_print_temperature} ?T0 ; heat hotend to setting in Cura and WAIT

... printer has to know how many steps the extruder has to make to extrude 100mm of material... with less steps you get underextrusion, with more steps you get overextrusion! Therefore you need to calibrate this! --> https://www.thingiverse.com/groups/ctc-3d-printer-owners/forums/general/topic:7915

Did you calibrate your printer extruder e-steps?

Happy Printing...

... but still wondering what setting you are using

Don't think so... show me the setting you use... "My" cave is open as you can see!