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UM2: First layer of bridging is very weak


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Posted (edited) · UM2: First layer of bridging is very weak


I am trying to print a drag chain (I have attached the STL) and it has this 22mm bridge which I get a lot of trouble with.


As you can see on these pictures the first one or two layer when the bridging starts are really weak. They are so weak that they easily pops of with some minor pressure on them.


Printer: Ultimaker 2 (35W heat cartridge, custom fan shroud)

Material: BASF Ultrafuse PET
Temperature: 220 C

Print speed: 60mm/s

Experimental bridging enabled

Cura 4.12.1


I have tried different print speeds, different temperatures but I can not solve this. It seems like the experimental bridge settings are screwing this up for my printer, because I don't get the same effect when NOT using the bridge settings. I think I need the experimental bridge settings because the gap is much harder for my printer to print nicely if I don't use it.


I hope someone can understand my problem. I think the images explains it better then my text 😄


/ Oskar





Edited by oskars
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    Posted · UM2: First layer of bridging is very weak

    I have done some more testing and I have concluded that turning off "Bridge has multiple layers" doesn't help.


    The problem seems to be in this part:




    It feels like it is the first "WALL-OUTER" in this layer that is printed poorly due to maybe decreased flow rate?! But it doesn't seem to be decreased. I use F1800 for all other "normal" outer walls also.


    G1 F1800 X96.4 Y124.688 E1475.27356
    G1 X96.4 Y109.218 E1476.51116
    G1 X98.6 Y109.218 E1476.68716
    G1 X98.6 Y109.093 E1476.69716
    G1 X98.6 Y107.218
    G1 X100 Y107.218
    G1 F900 X123 Y107.218 E1477.61716
    G1 X124 Y107.218 E1477.77716
    G1 F1125 X124.4 Y107.218 E1477.82836
    G1 F1800 X124.4 Y109.218 E1477.98836
    G1 X126.6 Y109.218 E1478.16436
    G1 X126.6 Y124.688 E1479.40196
    G1 X125.15 Y124.688 E1479.51796
    G1 X125.15 Y122.293 E1479.70956
    G1 X125.15 Y120.418
    G1 X125.15 Y120.018
    G1 F900 X97.85 Y120.018 E1480.80156
    G1 F1800 X97.85 Y124.688 E1481.17516
    G0 F7200 X97.65 Y124.688
    G0 X97.38 Y124.218
    G0 X97.38 Y119.548
    G0 X97.45 Y119.618
    G1 F3600 X97.45 Y124.288 E1481.54876
    G1 X96.8 Y124.288 E1481.60076
    G1 X96.8 Y109.618 E1482.77436
    G1 X99 Y109.618 E1482.95036
    G1 X99 Y107.618
    G1 X100 Y107.618
    G1 F900 X123 Y107.618 E1483.87036
    G1 F1800 X124 Y107.618 E1484.03036
    G1 F3600 X124 Y109.618 E1484.19036
    G1 X126.2 Y109.618 E1484.36636
    G1 X126.2 Y124.288 E1485.53996
    G1 X125.55 Y124.288 E1485.59196
    G1 X125.55 Y121.805 E1485.7906
    G1 X125.55 Y119.618
    G1 X125.15 Y119.618
    G1 F900 X97.85 Y119.618 E1486.8826
    G1 F1800 X97.45 Y119.618 E1486.9466
    G0 F7200 X97.38 Y119.548
    G0 X125.238 Y118.656
    G0 X125.238 Y113.99
    G0 X123.6 Y110.018
    G1 F3600 X125.8 Y110.018 E1487.1226
    G1 X125.8 Y117.031 E1487.68364
    G1 X125.8 Y119.218
    G1 X125.15 Y119.218
    G1 F900 X97.85 Y119.218 E1488.77564
    G1 F1800 X97.2 Y119.218 E1488.87964
    G1 F3600 X97.2 Y110.018 E1489.61564
    G1 X99.4 Y110.018 E1489.79164
    G1 X99.4 Y108.018
    G1 X100 Y108.018
    G1 F900 X123 Y108.018 E1490.71164
    G1 F1800 X123.6 Y108.018 E1490.80764
    G1 F3600 X123.6 Y110.018 E1490.96764
    G0 F7200 X123.21 Y110.408
    G1 F1800 X125.41 Y110.408 E1491.14364
    G1 X125.41 Y117.078 E1491.67724
    G1 X125.41 Y118.828
    G1 X125.15 Y118.828
    G1 F900 X97.85 Y118.828 E1492.98764
    G1 X97.59 Y118.828 E1493.02924
    G1 F1800 X97.59 Y110.408 E1493.70284
    G1 X99.79 Y110.408 E1493.87884
    G1 X99.79 Y110.158 E1493.89884
    G1 X99.79 Y108.408
    G1 X100 Y108.408
    G1 F900 X123 Y108.408 E1495.00284
    G1 X123.21 Y108.408 E1495.03644
    G1 F1800 X123.21 Y110.408 E1495.19644
    G0 F7200 X125.238 Y113.99
    G0 X125.409 Y118.8
    G1 F900 X97.589 Y118.8 E1496.5318
    G0 F7200 X97.589 Y118.4
    G1 F900 X125.409 Y118.4 E1497.86716
    G0 F7200 X125.409 Y118
    G1 F900 X97.589 Y118 E1499.20252
    G0 F7200 X97.589 Y117.6
    G1 F900 X125.409 Y117.6 E1500.53788
    G0 F7200 X125.409 Y117.2
    G1 F900 X97.589 Y117.2 E1501.87324
    G0 F7200 X97.589 Y116.8
    G1 F900 X125.409 Y116.8 E1503.2086
    G0 F7200 X125.409 Y116.4
    G1 F900 X97.589 Y116.4 E1504.54396
    G0 F7200 X97.589 Y116
    G1 F900 X125.409 Y116 E1505.87932
    G0 F7200 X125.409 Y115.6
    G1 F900 X97.589 Y115.6 E1507.21468
    G0 F7200 X97.589 Y115.2
    G1 F900 X125.409 Y115.2 E1508.55004
    G0 F7200 X125.409 Y114.8
    G1 F900 X97.589 Y114.8 E1509.8854
    G0 F7200 X97.589 Y114.4
    G1 F900 X125.409 Y114.4 E1511.22076
    G0 F7200 X125.409 Y114
    G1 F900 X97.589 Y114 E1512.55612
    G0 F7200 X97.589 Y113.6
    G1 F900 X125.409 Y113.6 E1513.89148
    G0 F7200 X125.409 Y113.2
    G1 F900 X97.589 Y113.2 E1515.22684
    G0 F7200 X97.589 Y112.8
    G1 F900 X125.409 Y112.8 E1516.5622
    G0 F7200 X125.409 Y112.4
    G1 F900 X97.589 Y112.4 E1517.89756
    G0 F7200 X97.589 Y112
    G1 F900 X125.409 Y112 E1519.23292
    G0 F7200 X125.409 Y111.6
    G1 F900 X97.589 Y111.6 E1520.56828
    G0 F7200 X97.589 Y111.2
    G1 F900 X125.409 Y111.2 E1521.90364
    G0 F7200 X125.409 Y110.8
    G1 F900 X97.589 Y110.8 E1523.239
    G1 X97.489 Y110.8
    G0 F7200 X99.789 Y110.4
    G1 F900 X123.209 Y110.4 E1524.36316
    G0 F7200 X123.209 Y110
    G1 F900 X99.789 Y110 E1525.48732
    G0 F7200 X99.789 Y109.6
    G1 F900 X123.209 Y109.6 E1526.61148
    G0 F7200 X123.209 Y109.2
    G1 F900 X99.789 Y109.2 E1527.73564
    G0 F7200 X99.789 Y108.8
    G1 F900 X123.209 Y108.8 E1528.8598
    G1 X123.309 Y108.8
    G0 F7200 X125.238 Y113.99
    G0 X125.826 Y119.397
    G0 X125.785 Y119.438
    G1 F1800 X125.873 Y119.632 E1528.87091
    G1 X125.873 Y123.875 E1529.09219
    G1 X125.971 Y124.06 E1529.1031
    G0 F7200 X126.003 Y124.029
    G0 X125.578 Y119.59
    G0 X97.422 Y119.59
    G0 X97.254 Y123.928
    G0 X97.172 Y124.01
    G1 F1800 X97.124 Y123.775 E1529.11608
    G1 X97.124 Y119.532 E1529.34558
    G0 F7200 X97.2 Y119.336
    G0 F600 X97.2 Y119.336 Z10.3
    G0 F7200 X97.85 Y120.018


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