Step 5. Glue the 3D-printed spacer on top of the syringe plunger. Then glue the bolt on top of the spacer. Keep everything centered (fig.5). Figure 5. The bolt and 3D-printed spacer glued to the top of the syringe plunger. Step 6. Place the spring on the plunger and insert the plunger into the syringe. Then place the syringe through the 3D-printed case. Glue the pipette with the 3D-printed connector onto the syringe (fig.6). Figure 6. The syringe plunger inserted into the syringe with the spring. Next the syringe was glued onto the 3D-printed connector after it was inserted into the 3D-printed case. Step 7. Screw the cap onto the case (fig.7). Figure 7. The cap screwed onto the 3D-printed case. Step 8. Screw on the 3D-printed adjustment circle then screw on the 3D printed top (fig. 8). The plastic pieces will self cut threads when you screw them on. You can make this easier by tapping threads in the pieces. Figure 8. The 3D-printed adjustment ring screwed onto the bolt followed by the 3D printed cap. How to use the pipette To use the pipette, press the plunger down (fig.9). Then place the pipette tip in liquid and slowly release the plunger. Next move the pipette to where you want to dispense the liquid and depress the plunger. To adjust the amount of liquid pipetted turn the adjustment ring and measure with the pipette how much is being taken up (fig.10). Adjust the ring till you get the amount you want to pipette. Figure 9. Pressing the plunger with your thumb. Figure 10. The adjustment ring where you can set the amount of liquid to be pipetted is located between the cap and the case. Testing results
Step 5. Glue the 3D-printed spacer on top of the syringe plunger. Then glue the bolt on top of the spacer. Keep everything centered (fig.5). Figure 5. The bolt and 3D-printed spacer glued to the top of the syringe plunger. Step 6. Place the spring on the plunger and insert the plunger into the syringe. Then place the syringe through the 3D-printed case. Glue the pipette with the 3D-printed connector onto the syringe (fig.6). Figure 6. The syringe plunger inserted into the syringe with the spring. Next the syringe was glued onto the 3D-printed connector after it was inserted into the 3D-printed case. Step 7. Screw the cap onto the case (fig.7). Figure 7. The cap screwed onto the 3D-printed case. Step 8. Screw on the 3D-printed adjustment circle then screw on the 3D printed top (fig. 8). The plastic pieces will self cut threads when you screw them on. You can make this easier by tapping threads in the pieces. Figure 8. The 3D-printed adjustment ring screwed onto the bolt followed by the 3D printed cap. How to use the pipette To use the pipette, press the plunger down (fig.9). Then place the pipette tip in liquid and slowly release the plunger. Next move the pipette to where you want to dispense the liquid and depress the plunger. To adjust the amount of liquid pipetted turn the adjustment ring and measure with the pipette how much is being taken up (fig.10). Adjust the ring till you get the amount you want to pipette. Figure 9. Pressing the plunger with your thumb. Figure 10. The adjustment ring where you can set the amount of liquid to be pipetted is located between the cap and the case. Testing results